OF PASSIFLORA, DISEMMA, AND TACSONIA. 199 
is perfectly susceptible of fertilization with the pollen of other 
species, one of these ovaries alone set, and this proved utterly 
void of seeds. 
2. P. cerulea No.1 as female.—I placed pollen of P. cerulea 
No. 2 upon the stigmas of four flowers of P. cerulea No. 1, and 
the ovaries of two of these swelled slightly, but they ultimately 
shanked without yielding any seed. I had more successful results 
with pollen of P. cerulea No. 3 upon the stigmas of P. cerulea 
No. 1, as, from four flowers thus treated, three ovaries set, of 
which only one shanked off, while the others, fully maturing, 
yielded conjointly 237 apparently good seeds. I also succeeded 
in fertilizing P. eerulea No. 1 with pollen of P. racemosa, as six 
flowers thus treated produced three ovaries ; of these two shanked 
off, only one maturing; this yielded 115 seeds, of which 87 were 
to all appearance good. Again, by applying pollen of P. alata 
No. 1 to the stigmas of P. cerulea No. 1, the fruits in every case 
aborted ; and so in experiments on P. eerulea No. 1 with pollen of 
P. edulis, the ovaries of not even one swelled. Lastly, I fertilized 
twelve flowers of the P. cerulea No. 1 with own pollen, but all 
of them dropped off without effecting the slightest development 
of a single ovary. 
3. P. cerulea No. 2 as female.—I placed pollen of P. cerulea 
No. 1 upon the stigmas of four flowers of the P. cerulea No. 2, 
and thus got three ovaries to set; of these two shanked off; the 
other, maturing, contained 154 seeds, of which 143 seemed to be 
good. Again, from four flowers of the P. cerulea No. 2 fertilized 
with pollen of the P. cerulea No. 3, I obtained three fruits, and 
these yielded in all 293 seeds, of which 262 were good. I also 
succeeded in fertilizing P. cerulea No. 2 with pollen of the P. 
racemosa, as, from three flowers thus treated, I obtained one fine 
plump fruit; this contained 105 seeds, of which 68 were appa- 
rently good. Again, by placing pollen of P. alata No. 1 upon the 
stigmas of four flowers of the P. cerulea No. 2, I got one ovary 
to set; this, however, dropped off prematurely and contained no 
good seed. Lastly, on P. eerulea No. 2 I impregnated eight 
flowers with own pollen; the results, however, in accordance with 
my previous experiments, showed that this plant, though suscep- 
tible to fertilization by pollen of other individuals of the same 
species, and also by that of other species, was nevertheless utterly 
impregnable to its own pollen, as all the flowers thus treated 
dropped off without effecting the setting even of a single ovary. 
4. I placed pollen of the P. alata No. 2 upon the stigmas of 
